/Engine/Source/Runtime/Renderer/Public/VariableRateShadingImageManager.h
Prepare VRS images and store them for later access. Should be run exactly once in Render(), before attempting to get any VRS images for that frame.
void PrepareImageBasedVRS ( [FRDGBuilder](API\Runtime\RenderCore\FRDGBuilder) & GraphBuilder, const [FSceneViewFamily](API\Runtime\Engine\FSceneViewFamily) & ViewFamily, const FMinimalSceneTextures & SceneTextures )